Environmental
Radon is a naturally occurring radioactive gas that enters homes primarily through:
AContaminated drinking water only
BCracks and openings in the foundation from surrounding soil and rock✓ Correct
CBuilding materials manufactured before 1985
DAirborne transmission from nearby industrial sites
Explanation
Radon is a naturally occurring gas produced by the decay of uranium in soil and rock. It enters homes through cracks in foundations, sump pits, and other openings. North Dakota has areas with elevated radon levels.
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